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Re: Strange results from lwarn + match-string

From: Stefan Monnier
Subject: Re: Strange results from lwarn + match-string
Date: Tue, 19 Feb 2008 22:39:48 -0500
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/23.0.60 (gnu/linux)

>>> (lwarn t :warning "0: %s" (match-string-no-properties 0))
>>> (lwarn t :warning "1: %s" (match-string-no-properties 1))
>>> (lwarn t :warning "2: %s" (match-string-no-properties 2))
>>> (lwarn t :warning "3: %s" (match-string-no-properties 3))
>> Since you don't know for a fact that lwarn is among the few functions
>> that do not affect match-data, you need to call all
>> 4 `match-string-no-properties' before you call the 4 `lwarn'.

> Hm. It cured the problem, but that was really a surprise.

There are very few functions which guarantee that they preserve
match-data, so if there's the slightest doubt, assume that match-data
will be destroyed,


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